SpotXchange, the performance-based video ad network, took the wraps off its retargeting service this week and shared a case study of a quick service restaurant that used it to achieve dramatically higher conversion results. For those not familiar, retargeting refers to the practice of tracking users' behavior on specific sites and then serving them different ads on these sites (or others) they subsequently visit, depending on what behavior they've exhibited. Re-targeting is common in online display advertising, but as SpotXchange's CEO Michael Shehan explained to me, it's still nascent in online video advertising.

Because of its emotional impact, most video advertising is focused on branding, rather than trying to elicit a direct response, which is of course what search marketing is all about. Retargeting is a tactic to try blending the two benefits. Imagine a user who has poked around at a site promoting trips to the Caribbean, but who didn't click on the "Book Now" link. In subsequent visits to this site or others, video ads promoting Caribbean travel, with messaging like "What are you waiting for" and clear calls to action would help move the user along the buying process. It's still early for video ad retargeting, but to the extent that it can help conversion rates and in turn spur higher CPMs, it will be welcomed in the market.

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